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<p>Provides classes for properties, property animation, and timelines.</p>

<p>There are four properties (each extends the <a href="Property.html">Property</a> class):
<a href="Bool.html">Bool</a> (boolean), <a href="Int.html">Int</a> (32-bit integer), 
<a href="Fixed.html">Fixed</a> (16:16 fixed-point value), and 
<a href="Color.html">Color</a> (ARGB color).</p>

<p>A property may have a <a href="Behavior.html">Behavior</a> which controls
how its value changes over time. A common behavior is a <a href="Tween.html">Tween</a>, which 
animates a property from one value to another over time, optionally with an 
<a href="Easing.html">Easing</a> to make the tween look more natural.</p>

<p>A property may have a <a href="PropertyListener.html">PropertyListener</a> that is notified
when the property's value changes.</p>

<p>A <a href="Timeline.html">Timeline</a> is a collection of Property/Behavior pairs,
<a href="event/TimelineEvent.html">TimelineEvent</a>s, other Timelines, or other subclasses
of <a href="Animation.html">Animation</a>.</p>
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